It was the same when I played Xian Si for the first time. If I remember correctly, the place where you got lost was next to Chaohu Lake, right?

I remember jumping several times at that time, and finally found a certain rule: try a few more times and you will succeed. Don't press the space bar for too long. Just loosen the red space bar. If there is a jump prompt, I'm sure I can jump over it. Not without it.

I hope it helps you.